login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083203 a(1) = 1, then smallest number not included earlier such that a(n)*a(n+1) + 1 is a cube. 7

%I #9 Jan 08 2019 09:12:41

%S 1,7,9,38,35,117,91,8,614,39312,167143,9225632,27823518,3438671571811,

%T 810534219404852834,350099109163999874259659131507909,

%U 538073411436415103320989698699207584507533583587852139

%N a(1) = 1, then smallest number not included earlier such that a(n)*a(n+1) + 1 is a cube.

%C The next 3 terms are (to 2 significant digits) 4.1*10^95, 1.3*10^183, 3.6*10^351.

%e 7*9 + 1 = 64 = 8^3, 9*38 + 1 = 343= 7^3.

%Y Cf. A083204, A082536.

%Y Cf. A091569.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Apr 28 2003

%E Corrected and extended by _Vladeta Jovovic_, May 01 2003

%E More terms from _Michel ten Voorde_ Jun 23 2003

%E More terms from _Vladeta Jovovic_, Jun 29 2003

%E a(15) - a(17) from _David Wasserman_, Mar 18 2004

%E More terms from _David Wasserman_, May 20 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)